( wake-up calls)
1.
A wake-up call is a telephone call that you can book through an operator or at a hotel to make sure that you wake up at a particular time.
N-COUNT : usu sing
2.
If you say that something is a wake-up call to a person or group of people, you mean that it will make them notice something and start to take action.
The Ambassador said he hoped the statement would serve as a wake-up call to the government.
N-COUNT : usu sing , oft N to n